Improvement in gate and door-springs



-- PATENTE JUL 11 1,871 116800 r @Mmhmw N i@ @Wy UNITED STATES PATENT OFFICE.

ALONZO T. BOON AND LUOIEN MILLS, OF GALESBURG, ILLINOIS, ASSIGNORS T() THEMSELVES, FRANK HUGHES, AND WV. S. DEWEY, OF SAME PLACE.

IMPROVEMENT IN GATE AND DOOR-SPRINGS.

Specification forming part of Letters Patent N o. 116,800, dated July 11, 1871.

To all whom it may concern:

Beit known. that we, ALONZO T. BooN and LUCIEN MILLS, of Galesburg', county ot' Knox and State of Illinois, have invented certain 11nprovenients in Door and Grate-Springs, of which the following is a specilication:

Our invention has for its object to furnish a cheap, siniple, and etlicient spring for opening' or closing doors and gates; and the invention consists in securing one end of the coil or spiral spring within a cyliiidrical plate, and the other end by passing it through a .grooved sectional bar, one end oi' which is inade square and passed into a corresponding .square slot foi-ined in a spiral spring therein. Fig. 3 is a cross-section of Fig. l on the line .fr a'. Figs. 4 and 5 are detached views of the plates attached to the upper end ofthe spiral spring.

A is the door; B, the door-frame; C C, the hinges by which the door is hung in the frame. D is a spiral spring. E is a cylindrical-shaped plate with a hole centrally and longitudinallyY through it, through which a screw, c, is inserted for the purpose of securing it to the door-frame B next to the hinged side oi' the door A. The lower side-or side next the door-franie-of the plate E, is provided with an annular groove, c', in which the lower end of the spiral spring D curved and laid, passing out through a recess, c, in the outer ilange, as plainly shown at Fig. 2.

This arrangement for securing the lower end of the spiral spring to a gate or door is eii'ectual and simple, and with it the person using the gate or door may easily, without any tools except a screw-driver, substitute a new spring for a weakened old one-a thing impossible with the ordinary plates and inethod oiwattaching the spiral spring thereto.

`H is a :metal plate, with a hole pierced in its upper end, through which a screw, h', is inserted for the purpose of securing it to the door A near the hinged side, as shown in the drawing. The lower end of the plate H is enlarged, as shown, and pierced with a square hole, 11 the axis of which is in a direction pointing toward the plate E. I is a metallic bar, round in its cross-section about one-half of its length and square the other half. The bar I is composed of two longitudinal sections or halves, I I, as shown at Figs. 4 and 5, each halfhaving a transverse groove, 1'. i., on its face adjacent to its fellow, which grooves form, when the plates I I are brought together, a circular hole through thein. The plates I l are also pierced with holes S S for purposes hereafter described.

The operation of our invention is as follows: The plate H is attached to the door. The plate E is attached to the side frame B, securing thereby the lower end of the spring D. The halves ot' the bar I are now put together, with the upper end of the spring D, which is bent across the center of the spiral, resting in the hole 'i and the cylindrical part of bar I projecting into the hollo'w spiral, as shown at Fig. 1. A rivet through the hole S now secures the barI irlnly to the spring I). r[he spring is now strained in a direction with its spiral twist and the square end of the bar I is then inserted in the square hole in the plate H, in which' position it will operate to close the gate or door. By turning the spiral spring on. a strain opposite to its twist it will tend to open doors and gates.

V V V V are studs on the plates E and H, for the purpose of holding theni secure tothe wood of door and frame.

XVe claim-` In coinbination with the coil D, the fixed-plate E having the annular groove c and recess c, the removable plates I I having grooves ifi, and the slotted plate H, substantially as and for the purpose specified.

ALONZO T. BOON. LUOIEN MILLS.

Vitnesses AW. S. DEWEY,

I-I. W. CARPENTER. 

